Roof-jack.



M. BAUER.

ROOF JACK.

APPLICATION FILED DEC.2l, :914.

1,226,169. PatentedMay15, 1917.

IN VEN TOR.

' ATTORNEYS.

WITNESSES:

MARTIN BAUER, OF CLEVELAND, OHIO.

ROOF-JACK.

Specification of Letters Patent.

Patented May 15, 1917.

Application filed December 21, 1914. Serial No. 878,437.

To all whom it may concern..-

Be it known that I, MARTIN BAUER, a citizen of the United States, andresident of Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented certain new and useful Improvements in Roof-Jacks, of which Ihereby declare the following to be a full, clear, and exact description,such as will enable others skilled in the art to which it appertains tomake and use the same.

The objects of the invention are to provide a roof jack or bracket foruse upon slated or shingled roofs which is readily applied theretoand'detachable therefrom, and provides means for supportinga plank inthe horizontal position which serves as a scaffold upon which a workmancan operate upon the roof to repair the same or to paint portions of thehouse which are otherwise difficult of access.

The invention comprises means for adjusting the bracket to adapt it toroofs of varying pitch so that the plank supporting member will alwaysremain level, and also means for engaging the lower ends of a ladder toretain the same when laid upon the roof.

It also comprises the details of construction and combination andarrangement of parts hereinafter described, shown in the accompanyingdrawings and specifically pointed out in the claims.

In the accompanying drawings Figure 1 is a perspective view showing thedevice mounted upon a slate roof; Fig. 2 is an enlarged view of thedevice; Fig. 3 is a side elevation thereof; Fig. 4c is a perspectiveview of the blade by means of which the bracket is attached to the roof;Fig. 5 is a front elevation of one of the folding ladder supportingattachments; Fig. 6 is aside elevation thereof; Fig. 7 is a transversesection of the attaching blade and its support showing means foradjusting the blade; Fig. 8 is a detail view of the connecting rivettherefor; Fig. 9 is a transverse section of the blade and bar showingthe cup shaped recess in the bar and securing bolt for the bladeaffording a close frictional grip to prevent slipping; Fig. 10 is afront elevation of the jack showing rack adjustment therefor.

In these views the bracket is T shaped and comprises preferably a bar A,the extremity of which is attached by riveting or otherwise to an anglebar B which forms the cross bar of the T. C is the blade by means ofwhich the bracket is attached to the roof.

The body portion can be formed of any suitable metal of suiiicientthickness to be rigid, but the blade C is preferably formed of a thinand fiat band of spring steel, and is adjustable upon the bar A by meansof the slot 0 in the blade, and thumb nut. C and screw C secured in thebar A, which also forms a clamping means for the blade. A projectingkeeper C at the inner extremity of the blade passes through the slot (5in the bar A and serves to keep the parts in alinement and permits theblade to slide freely upon the bar.

Ribs R, R, are formed on the faces of blade C and bar A to insurerigidity thereof. See Fig. 4.

The outer extremity of the blade is illserted underneath the shingles orslate of a roof as at S in Fig. 1 and will engage with one of the nailsas at S and will prevent the bracket from being withdrawn. Since slateare made in several sizes it is advisable to supply the blade with aseries of similar notches c, 0 intermediate of its ends so that at leastone of them can be made to engage with a nail in the roof and retain thebracket in place.

A brace member A preferably connects the bar A and cross bar B topreserve the required rigidity of the parts.

1 The platform D which supports one end of the plank and is designed toalways remain level without reference to the pitch of the roof uponwhich the bar A rests, is adjustably supported by means of a bar E whichis pivoted at the forward end upon a raised bearing member F upon theforward end of the bar A, and at its rear extremity the bar E is adjustably mounted for vertical elevation and depression by means of twovertically engaging racks, G and H, one of which is pivoted at its upperend to the outer extremity of the bar E, and the other is pivoted at itslower end to the hearing I upon the cross bar B.

The racks are loosely assembled by means of an encircling member M andare slidably movable upon each other. A cam K pivoted in the member Mserves to clamp them in the adjusted position. See Fig. 10.

A projection G upon the upper rack base plate,

engages the outer edge of a board if it should be desired to use onelaid across the platform D. The front wall of the angle bar B islongitudinally slotted at B B and pointed dogs L, L, are supported uponsaid bar and are made adjustably movable thereon by means of clampingbolts 1 and nuts 1.

The pointed dogs are designed to rest in the crevices between the slateas shown-in Fig. 1 and to assist the hooked blade C in holding thebracket in place.

The plank is extended over two of the brackets or a bracket can be usedalone as a seat or to support one end of a plank, the other end of whichmay rest upon some portion of the building. A ladder can also besupported by the bracket.

To facilitate the use of a ladder folding arm s W, IV, may be pivoted tothe extremities of the bar B and the feet of the ladder can rest uponthem.

An extension to on each arm WV prevents it from folding outward when theweight of the ladder is brought to bear upon it. See Figs. 5 and 6.

, The bolt passes through a cup shaped elevation C upon the bar A andwhen the blade is clamped tightly the blade is drawn into the recess,thus preventing slipping of the parts, which would be exceedinglydangerous to the user.

Having described the invention what I claim as new and desire to secureby Letters Patent is:

. 1. In a roof jack, in combination, a T- shaped base plate, a thinflexible blade adjustably secured to the center arm of said saidflexible blade having a hook in its edge, pointed dogs laterallyadjustable upon the cross arm. of said base plate, a plank supportingmember pivoted in the outer end of said base plate, and a longitudinallyadjustable arm having one end floples, of this patent may be obtainedfor pivotally attached to said cross arm and the other end to said planksupporting member.

2. In a roof jack, in combination, a T shaped base plate, a thin bladelongitudinally adjustable upon the center arm of said base plate andhaving an inclined slot in one edge forming a retaining hook, laterallymovable dogs adjustably secured in the cross arm of said base plate, aplank supporting member pivoted in the outer extremity of the long'armof said base plate, and a divided arm connecting said cross bar andouter end of said plank supporting member, engaging racks upon theportions of said divided arm and means for rigidly engaging said rackswith each other.

3. In a roof jack, a T-shaped bed plate, a thin metal bladelongitudinally adjustable upon the long arm of said bed plate, saidblade provided with a nail engaging means, means for securing said bladeand arm rigidly together, a plank supporting member pivoted in the longarm of said bed plate, and means for adjustably supporting the outer endof said plank supporting member upon said base plate.

4. In a roof jack, in combination, a T- shaped base plate, a thin metalbladelongitudinally adjustable upon the long arm,

means for securing the same in selected positions, means upon said bladefor engaging a nail, a plank supporting member pivotally connected withsaid bed plate, means for adjustably supporting the front extremity ofsaid plank supporting member upon said bed plate, and laterally movablegripping dogs adjustably secured in the cross bar of said bed plate.

In testimony whereof, I hereunto set my hand this 14th day of November,1914:.

MARTIN BAUER. In presence of- WM. J. KLo'rzBAoH, 7M. M. Mormon.

Washington, I). G.

